WattCost

Data through June 2026

Running cost · Water Heaters (Electric) · ENERGY STAR certified

Rheem PROPH65 T0 RH120-MSO

For a standard household draw pattern, the Rheem PROPH65 T0 RH120-MSO uses a certified 971 kWh per year: roughly $178 annually at the national average rate. That's close to the middle of the certified pack — about 20% under the median electric water heater, ranked 211 of 510. The same unit costs $127 a year in Nevada but $512 in Hawaii — electricity rates, not the appliance, make the difference.

Dimensions 64.2" H × 24.3" W

Estimated annual running cost · U.S. average rate 18.3¢/kWh

$178/yr

$125 · cheapest certified water heaters (electric)$319 · priciest
Per month
$14.84
Per day
49¢
Certified use
971 kWh/yr
Type
Hybrid/Electric Heat Pump
Heat pump type
120 Volt Integrated HPWH
Storage volume
59 gal
First-hour rating
63 gal
UEF
3.12
681 kWh1,741 kWh
Where the Rheem PROPH65 T0 RH120-MSO (▮) sits among all 510 certified water heaters (electric), by annual kWh

What it costs in every state

Rheem PROPH65 T0 RH120-MSO: 971 kWh/yr × each state's average residential rate (EIA)
StateRate ¢/kWhThis model $/yrRelative cost
Alabama16.4¢$159
Alaska28.2¢$274
Arizona15.2¢$147
Arkansas14.1¢$137
California34.7¢$337
Colorado17.1¢$166
Connecticut24.3¢$236
Delaware19.3¢$187
District of Columbia24.4¢$237
Florida15.1¢$147
Georgia16.4¢$159
Hawaiipriciest52.7¢$512
Idaho14.4¢$140
Illinois19.9¢$193
Indiana17.5¢$170
Iowa15.9¢$155
Kansas15.7¢$153
Kentucky14.3¢$138
Louisiana13.5¢$131
Maine29.6¢$287
Maryland21.8¢$212
Massachusetts29.6¢$288
Michigan23.0¢$223
Minnesota17.5¢$170
Mississippi14.9¢$144
Missouri16.2¢$157
Montana15.1¢$147
Nebraska13.3¢$129
Nevadacheapest13.1¢$127
New Hampshire27.0¢$262
New Jersey24.9¢$242
New Mexico15.1¢$146
New York29.5¢$286
North Carolina14.7¢$143
North Dakota14.1¢$137
Ohio19.2¢$186
Oklahoma14.3¢$139
Oregon16.3¢$158
Pennsylvania21.7¢$211
Rhode Island29.2¢$284
South Carolina15.6¢$151
South Dakota15.4¢$149
Tennessee14.1¢$137
Texas15.9¢$155
Utah13.4¢$130
Vermont24.4¢$237
Virginia17.2¢$167
Washington14.9¢$145
West Virginia15.4¢$150
Wisconsin19.6¢$190
Wyoming15.2¢$148

Certified models closest in efficiency

electric water heaters within reach of 971 kWh/yr
ModelkWh/yr$/yr (US avg)
Friedrich PROH65 T0 FD120-M971$178
Friedrich PROH65 T0 FD120-MSO971$178
Rheem PROPH65 T0 RH120-M971$178
Rheem XE65T10HM00U0971$178
Rheem XE65T10HMS00U0971$178
Richmond 10E65-HP120M971$178

Run your own numbers

Your rate, your numbers

Per day
49¢
Per month
$14.84
Per year
$178

971 kWh/yr × 18.3¢/kWh = $178/yr

Prefilled with this model's certified 971 kWh/yr — adjust if your usage differs from the DOE test basis. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.

Questions, answered with the data

How much electricity does the Rheem PROPH65 T0 RH120-MSO use?
ENERGY STAR certifies the Rheem PROPH65 T0 RH120-MSO at 971 kWh per year. The certified annual kWh comes from the DOE Uniform Energy Factor test, which simulates a typical household's daily hot-water draw pattern. Only electric models (including heat-pump units) are listed — gas models burn gas, not kWh.
How much does the Rheem PROPH65 T0 RH120-MSO cost to run per month?
About $14.84 a month at the U.S. average residential rate (18.3¢/kWh) — 49¢ a day, or $178 a year. Your state's rate moves this up or down; see the table above.
Is the Rheem PROPH65 T0 RH120-MSO energy efficient?
It uses 20% less electricity than the median certified electric water heater.
What does the Rheem PROPH65 T0 RH120-MSO cost to run in the cheapest vs. priciest state?
At current residential rates it costs about $127 a year in Nevada (13.1¢/kWh) and $512 in Hawaii (52.7¢/kWh).

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